number.wiki
Number

43

43 is a prime, odd, a calendar year.

Cousin Prime Deficient Number Prime Sexy Prime Squarefree Twin Prime Year

Properties

Parity
Odd
Digit count
2
Digit sum
7
Digital root
7
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
44

Primality

43 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 43
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 43)
1 × 43
First multiples
43 · 86 · 129 · 172 · 215 · 258 · 301 · 344 · 387 · 430

Representations

In words
forty-three
Ordinal
43rd
Roman numeral
XLIII
Binary
101011
Octal
53
Hexadecimal
2B

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 41 (gap of 2)
  • Next prime: 47 (gap of 4)

Pair status: twin with 41, cousin with 47.

ASCII character

As an ASCII codepoint, 43 is +. Printable ASCII character +.

Hex color
#00002B
RGB(0, 0, 43)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.43.